Quantum, Explained Simply
Easy-to-read articles on quantum security and quantum computing: what’s changing, why it matters, and what you can do about it. Every article is written for newcomers and links to its sources.
What Is a Quantum Computer? A Beginner’s Guide
Quantum computers are not just faster laptops. This guide explains what makes them different, what they could be good at, and what they cannot do.
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24 articles
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Quantum Basics • 3 min readSeptember 2026
A Plain-English Glossary of Quantum Terms
From qubits to Q-Day: more than 30 quantum and post-quantum terms explained in a sentence or two, with no maths required.
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Strategy & Policy • 2 min read
July 2026The Executive Playbook for Q-Day: Six Steps to Start Now
Q-Day is the day a quantum computer can break today’s encryption. You don’t need to know when it will come to start preparing. Here’s a practical plan for leaders.
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Quantum Security • 2 min readJune 2026
How Many Qubits Does It Take to Break RSA-2048?
Estimates of the quantum computer needed to break today’s encryption have dropped sharply. Here’s what the numbers mean and why they keep changing.
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Strategy & Policy • 2 min read
May 2026What Quantum Computing Means for Banks and Payments
Finance depends on encryption for payments, trading and customer data. Here’s where the quantum risk sits and what regulators and central banks are doing.
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Quantum Computing • 2 min readApril 2026
Quantum Sensing: The Quantum Technology Already in Everyday Use
While quantum computers are still maturing, quantum sensors already keep time for GPS and help doctors see inside the body. Here’s how.
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Quantum Computing • 2 min readMarch 2026
Quantum Machine Learning: Separating Hype from Reality
Combining two buzzwords makes for exciting headlines. Here’s what quantum machine learning could genuinely offer, and the obstacles it faces.
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Quantum Computing • 2 min readFebruary 2026
Can Quantum Computers Solve Optimisation Problems? An Honest Look
Route planning, scheduling and portfolio selection are often named as quantum use cases. Here’s what the evidence actually shows.
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Quantum Computing • 2 min read
January 2026Simulating Molecules: Quantum Computing’s Most Promising Use
Nature is quantum, so quantum computers may be the best tool for modelling molecules. Here’s why chemistry is a leading application, and how far away it is.
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Quantum Computing • 2 min readDecember 2025
Quantum Advantage: What Has Actually Been Shown So Far?
Several teams have claimed quantum computers beat classical supercomputers. Here is what those experiments really proved, and what they didn’t.
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Quantum Basics • 2 min readNovember 2025
Superconductors, Ions, Atoms and Light: The Main Types of Quantum Computer
There is no single way to build a qubit. Here are the leading approaches, who is pursuing them, and their strengths and weaknesses.
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Quantum Security • 2 min readOctober 2025
Why Randomness Matters, and How Quantum Physics Can Provide It
Every encryption key starts as a random number. Weak randomness has broken real systems. Here’s how quantum random number generators help.
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Quantum Security • 2 min readSeptember 2025
Quantum Key Distribution: Sharing Secrets with Light
QKD uses the laws of physics to reveal eavesdroppers. It’s real and impressive, but it has important limits. Here’s a balanced guide.
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Quantum Security • 2 min readAugust 2025
Post-Quantum Encryption Is Already Here: Chrome, Signal, iMessage and SSH
Quantum-safe encryption isn’t a distant future. It already protects a large share of everyday connections. Here are the biggest real-world deployments so far.
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Quantum Security • 2 min readJuly 2025
Hybrid Encryption: Why the Internet Uses Old and New Locks Together
Many early post-quantum deployments combine a classical algorithm with a new one. Here’s why this belt-and-braces approach is the sensible way to switch.
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Strategy & Policy • 2 min readJuly 2025
Post-Quantum Deadlines: What NIST, the NSA, the UK and the EU Expect
Governments have started setting dates for retiring quantum-vulnerable encryption. Here are the key milestones in one place, explained simply.
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Strategy & Policy • 2 min readJuly 2025
Crypto-Agility: Building Systems That Can Change Their Locks
Encryption methods age and eventually break. Crypto-agility means designing systems so you can swap algorithms quickly, without rebuilding everything.
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Strategy & Policy • 2 min readJune 2025
Finding Your Encryption: A Beginner’s Guide to Cryptographic Inventories
You can’t upgrade encryption you don’t know about. A cryptographic inventory, sometimes called a CBOM, is the first step of every post-quantum migration.
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Quantum Basics • 2 min readMay 2025
Physical vs Logical Qubits: Why Error Correction Is the Real Race
Headlines count qubits, but raw numbers can mislead. The real milestone is turning many error-prone qubits into a few reliable ones.
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Quantum Security • 2 min readFebruary 2025
Is AES Safe from Quantum Computers? Grover’s Algorithm Explained
Quantum computers threaten RSA, but what about the AES encryption that protects stored files and most internet traffic? The answer is reassuring.
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Quantum Security • 2 min readFebruary 2025
Shor’s Algorithm: How a Quantum Computer Could Break Today’s Encryption
In 1994 Peter Shor found a quantum recipe that could crack RSA and elliptic-curve encryption. Here is the idea in plain language, and why it hasn’t happened yet.
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Quantum Security • 2 min read
January 2025Harvest Now, Decrypt Later: Why Today’s Data Is Already at Risk
Attackers can record encrypted data today and unlock it once quantum computers are powerful enough. Here’s how the threat works and how to judge your exposure.
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Quantum Basics • 2 min readDecember 2024
Superposition and Entanglement Explained Without the Maths
Two strange ideas sit at the heart of quantum computing. Here is what they actually mean, with everyday analogies and no equations.
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Quantum Basics • 2 min read
November 2024
What Is a Quantum Computer? A Beginner’s Guide
Quantum computers are not just faster laptops. This guide explains what makes them different, what they could be good at, and what they cannot do.
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Quantum Security • 3 min read
October 2024The Cryptographic Cliff: NIST’s Post-Quantum Standards, Explained
In August 2024, NIST published the first three encryption standards designed to resist quantum computers. Here is what they are, what they replace and what they mean for you.
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